fix(ecs-patterns): add a feature flag to override default behavior of creating public load balancers (under feature flag)

[axwilliamson-godaddy]

Issue # (if applicable)

Closes #32274.

Reason for this change

By default, Fargate services created with ApplicationLoadBalancedFargateService and NetworkLoadBalancedFargateService are created with public load balancers with no way to override this default behavior.

Description of changes

Adding a new feature flag @aws-cdk/aws-ecs-patterns:fargateServiceBaseHasPublicLBDefault that allows users to create private load balancers by default.

If this flag is not set, the default behavior for ApplicationLoadBalancedFargateService and NetworkLoadBalancedFargateService is to create a public load balancer (not changed).

If this flag is set to false, the behavior is that the load balancer will be private by default.

This is a feature flag as to keep compatibility with the old behavior.

Relevant issue: #32274

Description of how you validated changes

I have added unit tests and they pass.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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AWS CodeBuild CI Report

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• Commit ID: 7b7862a
• Result: FAILED
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